Ultra-precise time-frequency transfer method for dwdm optical transmission system

Abstract

The invention discloses an ultra-precise time-frequency transfer method suitable for a DWDM optical transmission system. The steps of the method are as follows: a. First establish a mathematical model of an ultra-precise optical fiber timing system; b. Fully realize high-precision time and frequency synchronization; c. Then use the fiber delay online monitoring technology to accurately measure the delay value of each fiber in the DWDM cable; d. The value is compensated to <0.1ns; e. Using fiber delay online monitoring technology and fiber delay automatic locking and equalization compensation technology to split and strip the negative effects of fiber delay drift and aging accumulation. Compared with the prior art, the present invention solves the problem that the change value of the optical fiber time delay in the optical communication network such as the existing optical synchronous digital system and the packet transmission network cannot be adaptively controlled, and the defects of the original time synchronization technology make it difficult to improve the synchronization accuracy. question.

Description

technical field [0001] The invention relates to the fields of ultra-precise time-frequency synchronization technology and optical fiber communication technology, in particular to an ultra-precise time-frequency transfer method suitable for a DWDM optical transmission system. Background technique [0002] At present, Optical Synchronous Digital Hierarchy (SDH) and Packet Transport Network (PTN), as the main transport network, occupy a large proportion in my country's communication, electric power and national defense industries. With the development of optical communication systems towards higher speed and larger capacity, and the application of technologies such as Erbium-doped Fiber Amplifier (EDFA) and Dense Wavelength Division Multiplexing (DWDM) in optical fiber communication systems, the speed and capacity of optical fiber communication systems have been doubled in size. However, in the currently operating time-frequency synchronization network, it is difficult to achi...

AI Technical Summary

Problems solved by technology

The above-mentioned insurmountable technical bottleneck causes the change value of the optical fiber delay of the existing SDH and PTN communication networks to be unable to be adaptively controlled, and the defects of the original time synchronization technology make it impossible to improve the synchronization accuracy, especially when dense wavelength division multiplexing When (DWDM) technology is applied in the optical fiber communication system, the problem of high-precision time synchronization cannot be solved

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